Sdss-access

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- Bug fix for downloading IPL-1 products with sdss_access

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- Fixing broken tests with MWM paths

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- Minor path fixes for MWM and Astra paths

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- Adds new `isplate` and `pad_fieldid` special functions for BHM paths.

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- Adds new `configgrp` special function.

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- Breaking Change: switches `sdss_access` to use new SDSS dtn.sdss.org server
- Feature: adds new "data.sdss5.org" server to support rsync, curl, and http downloads for sdss5 products
- Adding new Sphinx docs for SDSS collaboration authentication
- Updates the public release check to now check todays date against the tree release date, and "DR" in release name.